Table 2. Summary of the main fluxes controlling the model global anthropogenic CO2 inventory (Cant).
| Total | TW | STMW | SPWM | IW | DW | |
|---|---|---|---|---|---|---|
(a) Ocean gain
|
σθ < 24.5 | 24.5 < σθ < 26.6 | 26.6 < σθ < 27.05 | 27.0 < σθ < 27.55 | 27.55 < σθ | |
| Inventory [PgC/yr] | 2.07 | 0.16 | 0.54 | 0.42 | 0.52 | 0.43 |
| Fractions [%] | — | 7.7 | 26.1 | 20.3 | 25.1 | 20.8 |
| Cumulative fractions [%] | — | 7.7 | 33.8 | 54.1 | 79.2 | 100 |
| (b) Air-sea | ||||||
| Fluxes [PgC/yr] | 2.04 | 0.57 | 0.60 | 0.36 | 0.42 | 0.09 |
| Fractions [%] | — | 27.9 | 29.4 | 17.6 | 20.6 | 4.4 |
| Cumulative fractions [%] | — | 27.9 | 57.4 | 75.0 | 95.6 | 100 |
| (c) Diapycnal fluxes divergence (Δoverturning) | ||||||
| Global [PgC/yr] | — | −0.36 | 0.12 | 0.12 | −0.07 | 0.19 |
| MWML [PgC/yr] | — | −0.47 | 0.13 | 0.23 | −0.03 | 0.16 |
| Interior [PgC/yr] | — | 0.11 | 0.00 | −0.11 | −0.04 | 0.03 |
| (d) Air-sea + Diapycnal fluxes (ϕ + Δoverturning) | ||||||
| Global [PgC/yr] | 2.04 | 0.21 | 0.72 | 0.48 | 0.35 | 0.28 |
| MWML [PgC/yr] | 2.04 | 0.10 | 0.73 | 0.59 | 0.39 | 0.25 |
| (e) Residual (a minus d; ~Δdiffusion) | ||||||
| GLOBAL [PgC/yr] | — | −0.05 | −0.18 | −0.06 | 0.17 | 0.15 |
| (f) Inventory [PgC] | 94.30 | 8.00 | 26.00 | 19.2 | 23.7 | 17.4 |
The values have been estimated using Eq. 4. The diffusive contribution is evaluated as a residual that implies that all kind of diffusive processes are considered, i.e., including any potential numerical diffusion. The coarse-graining of the ocean density structure into five discrete layers is as follows: tropical waters (TW), subtropical mode waters (STMW), subpolar mode waters (SPMW), intermediate water (IW), and deep water (DW). Values are net for each water mass.